An ML-guided scan combined with a high-precision effective field theory finds a small region of the minimal Left-Right Symmetric Model where the first parity-breaking phase transition yields gravitational waves detectable at BBO and DECIGO with SNR around 1 to 10.
Baryon asymmetry from left-right phase transition
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abstract
We extend the standard model fermions by a mirror copy to realize a left-right symmetry. During a strongly first order phase transition of the spontaneous left-right symmetry breaking, the CP-violating reflections of the mirror fermions off the mirror Higgs bubbles can generate a mirror lepton asymmetry and an equal mirror baryon asymmetry. We then can obtain an ordinary baryon asymmetry through the mirror fermion decays where a dark matter scalar plays an essential role. Benefitted from a parity symmetry for solving the strong CP problem, the cosmic baryon asymmetry can be well described by the ordinary lepton mass matrices up to an overall factor. In this scenario, the Dirac CP phase in the Majorana neutrino mass matrix can provide a unique source for the required CP violation. Furthermore, the Higgs triplet for type-II seesaw as well as the first generation of mirror charged fermions can be allowed at the TeV scale.
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Machine Learning Left-Right Breaking from Gravitational Waves
An ML-guided scan combined with a high-precision effective field theory finds a small region of the minimal Left-Right Symmetric Model where the first parity-breaking phase transition yields gravitational waves detectable at BBO and DECIGO with SNR around 1 to 10.